Door knocker



FIG. 1 is a front perspective view of a door knocker showing my newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front perspective view of the door knocker of FIGS. 1-6 withthe knocking element shown in a second position.

CLAIM The ornamental design for a door knocker, as shown and described.